namespace Front._1124
{
    public partial class MainForm : Form
    {
        public MainForm()
        {
            InitializeComponent();
        }

        public MainForm()
        {
            throw new NotImplementedException();
        }
    }
}

namespace Front._1124
{
    public partial class MainForm : Form
    {
        public MainForm()
        {
            InitializeComponent();
        }

        private void toolStripMenuItem_BookMgr_Click(object sender, EventArgs e)
        {
            BookMain bookMain = new BookMain();
            bookMain.ShowDialog();
        }
    }
}